What happens when you take oral contraceptives with folate?
Combined oral contraceptives gradually nudge folate status downward, and the effect becomes most relevant in the weeks right after you stop the pill, when fertility can return quickly. Here is the sequence:
- Estrogen-containing pills lower circulating folate. Across pooled studies, women using combined oral contraceptives tend to have lower plasma and red blood cell folate than non-users.
- The body loses folate faster. The mechanism is not fully settled, but it appears to involve increased urinary excretion of folate metabolites, altered enterohepatic recycling, and possibly reduced absorption of folate from food.
- Baseline diet and genetics decide how much it matters. In healthy women with good dietary folate, the drop is modest. For women with marginal intake, restricted diets, or folate-metabolism variants such as MTHFR C677T, the same relative drop can push folate into a less reassuring range.
- The risk window opens when the pill stops. Neural tube closure happens very early in pregnancy, often before a pregnancy is recognized, so depleted stores matter most just as fertility returns.
Why is this important?
Folate's most critical role is in early neural tube closure, which happens in the first few weeks after conception, often before a woman knows she is pregnant. Adequate folate during this window is the strongest modifiable protection against neural tube defects such as spina bifida and anencephaly. Public health guidance from the CDC and the U.S. Preventive Services Task Force recommends that all women of reproductive age get enough folate daily, regardless of whether they are actively trying to conceive.
For women coming off the pill, this matters because fertility can return almost immediately. A meaningful fraction of pregnancies are conceived within the first month or two after stopping a combined pill. If folate stores are low at that moment, the most vulnerable window for the developing neural tube lines up exactly with when intake matters most. This is also why folate-containing combined oral contraceptives (such as Beyaz and Safyral) were developed: to help maintain folate status while the pill is being taken.
The overall effect is real but modest. The point is not alarm; it is making sure folate is covered so that an unplanned or soon-after-stopping pregnancy is not the moment your stores happen to be lowest.
What should you do?
The goal is simple: keep folate covered throughout your reproductive years if you use hormonal contraception, even when pregnancy is not in your immediate plans. Do not change your contraception or start a new supplement based on this article alone; use the schedule below as a discussion guide with your doctor or pharmacist.
Before you change anything:
- Tell your doctor or pharmacist if you take a combined hormonal contraceptive and could become pregnant, and ask what folate intake is right for you.
- Mention any known MTHFR variant, restricted diet, prior pregnancy affected by a neural tube defect, or use of antiseizure medication, since these can change the recommendation.
Every day while on the pill:
- Maintain adequate folate, typically through a multivitamin or prenatal vitamin, as your clinician advises.
- If you have a folate-metabolism variant, ask whether the active form (L-5-methyltetrahydrofolate) is preferable for you.
- Include folate-rich foods most days: leafy greens (spinach, romaine), legumes (lentils, black beans), citrus fruits, asparagus, broccoli, and fortified grains.
When you stop the pill or plan to conceive:
- Continue folate before stopping and through early pregnancy if conception is possible, on a timeline your clinician sets.
- Ask whether you need a higher amount because of a prior neural-tube-affected pregnancy or antiseizure medication.
Which specific products are affected?
The folate effect is documented for combined oral contraceptives containing ethinyl estradiol plus a progestin. Common examples include Yaz, Yasmin, Lo Loestrin Fe, Ortho Tri-Cyclen, Sprintec, and their generic equivalents. The contraceptive patch and vaginal ring also deliver ethinyl estradiol systemically and likely produce comparable changes. Progestin-only pills have less data but appear to have a smaller effect.
For maintaining folate, several options exist. A standard multivitamin or prenatal vitamin typically contains folate. Standalone folate supplements are inexpensive and effective for most women. Methylfolate (5-MTHF, sometimes labeled Quatrefolic or Metafolin) is often preferred by women with MTHFR variants and is the form used in the folate-containing pills.
Folate-containing combined oral contraceptives, Beyaz and Safyral, deliver hormone and folate in one tablet. They remain combined oral contraceptives, so they carry the same venous thromboembolism (VTE) and other risks as other drospirenone-containing pills; the folate component does not change that risk profile.
The science behind it
The core evidence is a single, reasonably strong systematic review and meta-analysis:
- Shere M, Bapat P, Nickel C, et al. Association Between Use of Oral Contraceptives and Folate Status: A Systematic Review and Meta-Analysis. J Obstet Gynaecol Can. 2015;37(5):430-438. PMID 26168104. Pooling 17 observational studies covering roughly 2,800 women, the review found that oral contraceptive users had lower plasma and red blood cell folate than non-users, and it supports continued attention to folate intake in this group.
This is observational evidence, so it shows association rather than proven cause, and the magnitude is modest. The connection to neural tube defect prevention rests on the well-established, separate body of evidence behind universal folate recommendations from the CDC and U.S. Preventive Services Task Force, not on this single study.
Frequently Asked Questions
Does the pill cause a folate deficiency?
Not usually. It is associated with modestly lower folate levels, not outright deficiency in most healthy women with a reasonable diet. The concern is mainly about having low stores right when fertility returns after stopping.
Do I need a separate folate supplement if I am on the pill?
Many women already get enough through a multivitamin, prenatal, or diet. Whether you need a dedicated supplement depends on your diet, genetics, and pregnancy plans, so confirm with your doctor or pharmacist.
What about progestin-only pills, the patch, or the ring?
Progestin-only pills have less data and appear to have a smaller effect. The patch and ring deliver ethinyl estradiol systemically and likely behave like combined pills.
Does an MTHFR variant change what I should take?
It can. Women with folate-metabolism variants are often advised to use the active form, L-5-methyltetrahydrofolate. Ask your clinician whether this applies to you.
Should I switch to a folate-containing pill like Beyaz or Safyral?
That is a reasonable option to discuss, especially if a daily supplement is hard to remember. But these are still combined oral contraceptives with the same VTE risk as other drospirenone-containing pills, so it is a decision to make with your prescriber.
How long should I keep up folate after stopping the pill?
If pregnancy is possible, folate is recommended before stopping and through early pregnancy. Your clinician can set the exact timeline for your situation.
Key takeaways
- Combined oral contraceptives are associated with modestly lower folate levels, supported by a 2015 meta-analysis of observational studies.
- The effect matters most after you stop the pill, when fertility can return before a pregnancy is recognized.
- Keep folate covered during your reproductive years if you use hormonal contraception, through diet, a multivitamin, a prenatal, or a folate-containing pill.
- Women with MTHFR variants may be advised to use the active methylfolate form.
- Beyaz and Safyral combine hormone and folate but carry the same VTE risks as other drospirenone pills.
- Decide your specific folate plan with your doctor or pharmacist rather than changing anything on your own.